Abstract

We experimentally characterize the -factor in a silica microsphere with the poly(methyl methacrylate) coating. Experimental results demonstrated that the -factor of the coatedmicrocavity is higher than . Moreover, this coating is able to eliminate scattering from the unsmoothed surface and tune the optical field in the cavity. In the cavity interaction with quantum dots, the coating can not only increase the -factor of the microsphere with deposited quantum dots but also draw the maximal field to the interface where the quantum dots exist. Therefore, this coating method can highly enhance the interaction strength, and it will contribute to the cavity quantum electrodynamics study.

Received 13 December 2009Accepted 20 January 2010Published online 09 February 2010

Acknowledgments:

We acknowledge Y. Yang and X.-W. Wu for fruitful discussions. The work was supported by the National fundamental Research Program of China under Grant No 2006CB921900, the Knowledge Innovation Project of Chinese Academy of Sciences, Science Foundation of China under Grant Nos. 60537020 and 60121503. F.-W. Sun is supported by the starting funds from USTC for new faculty.